People say some daft things in internet discussion threads. Often when the shoes-off rule is discussed, people suggest that those with shoes-off homes probably leave the plastic sheeting on their furniture.
Does anybody really do that?
There is simply no comparison. Furniture is not going to be damaged by people sitting on it (unless they put their shoes on it- which some silly people do). But your shoes can certainly make a mess of floors and carpets.
Removing shoes at the door wil make you feel more comfortable. Sitting on a sofa with plastic sheeting is horrible, especially in the summer when one is wearing a t-shirt and shorts.
And plastic sheeting on furniture looks really silly anyway.
So I very much doubt that many people who keep their homes shoe-free really do leave plastic sheeting on their furniture.